JPS603650Y2 - small motor case - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a small motor case that houses a motor body in order to prevent electric noise of the motor.

Conventionally, the motor body was housed in a shield case to prevent electrical noise, etc., and the case and lid were connected by fitting the lid into the opening of the case from the outside and securing it with screws, or by attaching a claw piece to the case. However, this creates a gap between the case and the lid, which not only fails to completely prevent electrical noise, but also poses problems in assembly and parts costs, and is effective in preventing electrical noise. For example, in the case of an aluminum material, the tap hole is likely to become defective due to its softness, and in the case of only a pawl, the holding strength is weak, and other disadvantages have occurred.

Therefore, in the present invention, a plurality of adjacent pairs of grooves are formed on the edge of the opening of the case that houses the motor body, and a plurality of temporary fixing claws each having a width narrower than the edge are formed, and the lid is opened. After adjusting the inside of the motor body by temporarily fixing it with the claw piece, the difference is tightly fixed with the edge of the opening edge of the case and the temporary fixing claw, completely sealing the inside of the shield case and the motor main body parts. is fixed.

An embodiment of a small motor to which the present invention is applied will be described below with reference to the drawings.

Reference numeral 1 denotes a case of the motor body, which is formed into a cylindrical shape with one end closed by a non-magnetic metal with high electrical conductivity, such as aluminum.

A recess 2 is formed in the center of the closed surface 1a of the case 1, and a shaft hole 3 is bored in the bottom surface of the recess 2. Around the recess 2, an arcuate guide hole 4 centered around the shaft hole 3 is formed. 4' are provided facing each other, and on the other hand, a plurality of pairs of grooves 5a and 5b adjacent to each other in the axial direction are formed on the edge of the frontage portion 1b to form an edge 5' and this edge 5.
' A plurality of temporary fixing claws 5 having a width narrower than that of the edge 5 are formed.
A guide groove 6, which is deeper than the pair of grooves 5a and 5b, is formed at '.

An inner case 7, which is made of a magnetic metal such as iron, is closed at one end, and is shorter than the length of the case 1 is rotatably fitted into the case 1.

The closed surface 7a of the inner case 7 is provided with a large-diameter central hole 8 and hanging holes 9, 9' corresponding to the guide holes 4, 4' of the case 1, and the inner peripheral surface is provided with a raised portion 10. A cut protrusion 11 is provided, and a cylindrical magnet 12 is provided in the inner case 7.
The stator A is pressed against the protrusion 10 and is fitted and supported in a state where it is engaged with the protrusion 11 and positioned in the axial direction.
is configured.

A rotor B disposed within this stator A has a shaft 13. iron core 14
9 windings 15. The insulating plate 18 is composed of a commutator 16 and a commutator board 17, and is interposed between the iron core 14 and the winding 15. A plurality of protrusions 19 are protruded from both sides of the iron core 14. By fitting a ring-shaped weight 20 to this protrusion 19, the rotation of the rotor B is balanced.

This rotor B is inserted into the stator A so that the commutator 16 side is located on the open part 7b side of the inner case 7, and the shaft 13
One end thereof is fitted into the recess 2 of the case 1, is pivotally supported by a bearing 22 supported by a leaf spring 21, and projects outward from the shaft hole 3.

The brushes 23 and 23' at both poles, which are in sliding contact with the commutator 16, are connected to the brush base 25 by elastic support pieces 24 and 24'.
This brush board 25 is placed in the open part 7a of the inner case 7, and the projecting piece 25a protruding from the side surface is engaged with the guide groove 6 of the case 1, thereby positioning the brush board 25 with respect to the case 1. The rotation is stopped.

Further, a center hole 25b having a diameter equal to or larger than the diameter of the commutator 16 plus the width of the brush 23.23' and the support piece 24.24' is provided in the center of the brush board 25, and the shaft 13 is passed through the center hole 25b. At the same time, when assembling the motor, the distance between the brushes 23 and 23' is adjusted using a tool from the outside of the brush board 25 on the support pieces 24 and 24.
The brush board 25 is expanded to a size larger than the diameter of the commutator 16 against the elastic force of the commutator 16, so that the brush board 25 can be easily attached.

A cushion made of an elastic material such as rubber is adhered to the outer surface of the support pieces 24 and 24', and the brushes 23 and 23' are attached to the commutator 1.
6 to make stable contact.

The motor main body M is constructed as described above, and the magnetic neutral point in this motor main body M is adjusted by using the guide hole 4 of the case 1.
and 4' into the hanging holes 9 and 9' of the inner case 7, and by rotating this tool along the guide holes 4 and 4', the inner case 7 can be rotated relative to the case 1. The positional relationship between the stator A and the brushes 23 and 23', that is, the magnetic neutral point, can be adjusted from the outside.

A signal generator, for example, a frequency generator C, which generates a signal related to the rotation of the motor is disposed outside the brush board 25.
It is fitted into the open side of the case 1.

This frequency generator C consists of a rotating part 26 fixed to the shaft 13 of the rotor B and a fixed part 27 arranged corresponding to the outer periphery of the rotating part 26. -3 and ring-shaped magnets 26a that are alternately magnetized are fitted onto the outer periphery of the holding part 26b, and the fixed part 27 has teeth 27 arranged in a link shape opposite to the magnetized position of the magnets 26a.
The insulating bobbin 2 is placed inside the magnetic yoke 27b in which the
A coil 29 is disposed through the coil 8.

A plurality of conductive pins 30 are provided through the inner peripheral portion of the insulating bobbin 2B, and both ends of the conductive pins 30 are provided to protrude from both sides of the magnetic yoke 27b.

One end of the conductive pin 30 is fixed to the brush board 25, and two of the conductive pins 30 are attached to the support pieces 24 and 24 on the brushes 23 and 23'.
', and the other two are electrically connected through the brush board 25.
It is connected to lead wires 29a and 29b of the coil 29 at.

Such a frequency generator C has a lid 31 that closes the open surface of the case 1.
It can be suppressed by

The lid 31 is made of the same non-magnetic material as the case 1, and has a recess 31a on the inner surface of the central part, a through hole 32 from which the other end of each conductive pin 30 projects on the peripheral surface, and a hole 32 on the outer surface. A ground pin 33 is provided protruding from the.

The bearing 22 is fitted into the recess 31a of the lid 31 via the thrust receiver 22a, and is supported by the leaf spring 21 which is held between the fixing part 27 of the frequency generator C and the lid 31.
The other end of the shaft 13 of the rotor B is supported by the bearing 22 and the thrust bearing 22a.

A terminal board 34 is arranged on the outer surface of the lid 31, and the tips of conductive pins 30 protruding from the through holes 32 are fixed, and the brush board 2
5, and the lead wire 1 is connected to this terminal board 34.
is connected.

i31 is fixed to case 1 through opening 1b of case 1.
The plurality of temporary fixing claws 5 are each bent inward to hold the MB2 and temporarily fixed, and in this temporarily fixed state, the internal operation such as adjusting the magnetic neutral point of the motor, break-in operation, etc. adjustment, in this case rotational adjustment of the shaft 13, commutator 16 and brushes 23 and 23.
To check the contact with ', raise the temporary fixing claw 5 and remove the lid 31.

After adjusting in this way, the notch claws 5 are caulked, the temporary fixing claws 5 are caulked, and the edge 5 between the temporary fixing claws is
By bending and curling the lid 31 to tightly fix the lid 31 to the case 1, the case 1 has a completely sealed structure, and the motor body M and the frequency generator C are integrally fixed within the case 1.

The motor with a frequency generator configured as described above is housed in an external protective case 37 with anti-vibration rubbers 35 and 36 interposed on both end faces of the case 1, one of which is open, and when the external case 37 is opened. It is protected by fitting and fixing the lid 38 to the portion.

As described above, according to the present invention, a plurality of adjacent pairs of grooves form an edge and a temporary fixing claw narrower than this edge on the edge of the opening of the case in which the motor body is housed, and the case The cover that is fitted into the opening of the case is tightly fixed at all edges of the case opening by bending and curling the edges between the temporary fixing tabs while the lid is temporarily fixed using the temporary fixing tabs, making it easy to assemble the motor. Adjustment of the magnetic neutral point during the process, internal adjustments such as break-in operation, etc. can be performed with the lid temporarily attached to the case using only the temporary fixing claws, making it easier to inspect the interior during the motor assembly process. If adjustment is necessary, the lid can be easily removed by simply raising the temporary fixing claw, making it easy to inspect and adjust the interior. After completing this adjustment, the temporary fixing claw and edge By tightly fixing the lid, the inside of the case becomes completely sealed, preventing electrical and mechanical noise, and the lid can be fixed to the case not only with screws or claw pieces as in the past, but after internal adjustment. Since this is done by all edges of the opening, there is almost no risk of the lid being improperly fixed, and the internal parts can be held securely.Although the conductivity is particularly good, the material is flexible, so it is difficult to prevent mechanical damage. It is ideal for use with aluminum shield cases, which have weak strength and problems such as fixing the lid.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a small motor according to the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is an enlarged sectional view of the small motor according to the present invention housed in a protective case. M...Motor body, 1...Case, 1
b... Opening part, 5... Temporary fixing claw, 5a, 5b
......pair groove, 5'...edge, 31...
····lid.

Claims (1)

[Scope of utility model registration request] In a small motor case in which the motor body is housed and is made of a non-magnetic metal with high conductivity and formed into a cylinder with one side closed, adjacent pairs of grooves are formed at a plurality of places on the edge of the opening of the case. The pair of grooves form a plurality of edge portions and a plurality of temporary fixing claws narrower than the edge portion, and a lid made of a non-magnetic material to be fitted into the opening portion is connected to the edge portion. A small motor case that is tightly fixed with the above temporary fixing claws.